MCQ Questions for Class 10 Science Chapter 6 Life Processes

Students can refer to the following Life Processes Class 10 MCQ Questions with Answers provided below based on the latest curriculum and examination pattern issued by CBSE and NCERT. Our teachers have provided here a collection of multiple choice questions for Life Processes Class 10 covering all topics in your textbook so that students can assess themselves on all important topics and thoroughly prepare for their exams

Life Processes Class 10 MCQ Questions with Answers

We have provided below Life Processes Class 10 MCQ Questions with answers which will help the students to go through the entire syllabus and practice multiple choice questions provided here with solutions. As Life Processes MCQs for Class 10 Science pdf download can be really scoring for students, you should go through all problems provided below so that you are able to get more marks in your exams.

Life Processes Class 10 MCQ Questions

Question. Select the incorrect pair
(a)Respiration-Oxidation of food to obtain energy
(b)Nutrition-Obtaining and utilizing nutrient
(c)Transportation-Responses to stimuli
(d)Excretion-Removal of waste byproducts

Question. Which one of the following juices secreted in the human body does not contain any enzyme?
(a)Salivary juice
(b) Bile juice
(c)Gastric juice
(d) Pancreatic juice

Question. Rings of cartilage present in the throat ensure that
(a)the air passage collapses
(b)the air passage does not collapse
(c) the air is filtered entering the nostrils
(d)None of these

Question. The function of the lymph fluid is to
(a) Drains excess fluid from extracellular space back into the blood
(b) Carries digested and absorbed fat from intestine
(c) Circulates around the body and help in clotting of blood
(d)Both (a) and (b)

Question. Which of the following statements is incorrect about artery?
(a)It carries oxygenated blood from heart to different body parts.
(b)It is also called collecting vessel
(c)It is thick, elastic and muscular
(d)It has no valves.

Question. ————–the key organ of, cardiovascular system which acts as a muscular pump.
(a)Kidney
(b) Heart
(c) Lungs
(d) Stomach

Question. In artificial kidney, which substance passes from the blood to the dialysis fluid?
(a) Urea
(b) Heart
(c) Uric acid
(d) Creatinine

Question. Where are proteins first digested in the alimentary canal?
(a)Small intestine
(b) Oesophagus
(c) Mouth
(d) Stomach

Question. The organism having parasitic mode of nutrition is:
(a) Penicillium
(b) Plasmodium
(c) Paramecium
(d) Parrot

Question. Chemical reaction takes place during dark reaction of photosynthesis is
(a) photolysis
(b) hydrolysis
(c) carbon dioxide is bonded with RUBP
(d) nitrogen fixation

Question. Full name of N ADP is
(a) Nicotinamide dinucleotide phosphate
(b) Nicotine adenine dinuceotide phosphate
(c) Nicotinamide adenine dinucleotide phosphate
(d) None of the above

Question. Wavelength of visible light is
(a) 200 – 400 nm
(b) 400 – 700 nm
(c) 700 – 900 nm
(d) 100 – 200 nm

Question. Most of the photosynthesis (80%) which takes place on this earth is carried out by
(a) green plants on land
(b) algae present in fresh water
(c) algae found in ocean
(d) algae present in ocean and fresh water sources.

Question. The final product of digestion of carbohydrates and proteins are
(a) glycerol and amino acid respectively
(b) glucose and amino acids respectively
(c) amino acids and glycerol respectively
(d) amino acids and glucose respectively

Question. The presence of sugar in onion leaves can be tested with
(a) iodine
(b) copper sulphate solution
(c) lime water
(d) benedict’s solution

Question. CO₂ acceptor during dark reaction of photosynthesis is
(a) RUBP
(b) PEP
(c) NADPH
(d) ATP

Question. Compensation point refers to the intensity of light at which
(a) Rate of respiration = rate of photosynthesis
(b) Rate of respiration > rate of photosynthesis
(c) Rate of respiration < Rate of photosynthesis
(d) None of the above is correct

Question. Among the following which is a parasitic plant ?
(a) Plasmodium
(b) Cuscuta
(c) Amoeba
(d) Rhizobium

Question. Dark reaction and light reaction of photosynthesis takes place in
(a) stroma and grana of chloroplast respectively
(b) grana and stroma of chloroplast respectively
(c) grana only
(d) stroma only

Question. The nutrition in mucor is
(a) parasitic
(b) autotrophic
(c) saprophytic
(d) holozoic

Question. In amoeba the digestion is intracellular because
(a) amoeba is unicellular
(b) amoeba is multicellular
(c) amoeba is found is pond
(d) amoeba is microscopic animal

Question. Digestion of food in human starts from
(a) duodenum
(b) small intestine
(c) mouth
(d) large intestine

Question. The digestion of food is completed in the
(a) ileum
(b) duodenum
(c) stomach
(d) large intestine

Question. The most important function of villi in the small intestine is
(a) to provide strength to the intestine
(b) to provide space for capillaries and lacteals
(c) to provide increased surface area for absorption of digested food
(d) to provide habitat for bacteria

Question. The raw materials for photosynthesis are
(a) CO₂ & O₂₁
(b) sunlight and CO₂
(c) water and chlorophyll
(d) CO₂ and water.

Question. Oxygen is transported in blood mainly by
(a) leucocytes
(b) erythrocytes
(c) thrombocytes
(d) blood plasma

Question. The ultimate cause for the movement of water against the gravity in a tree is
(a) osmosis
(b) transpiration
(c) imbibitions
(d) photosynthesis

Question. Which of the following ahs no digestive enzyme ?
(a) Saliva
(b) Bile
(c) Gastric juice
(d) Intestinal juice

Question. Plants are green in colour because
(a) they absorb green light only
(b) they reflect green light
(c) they absorb green light but reflect all other lights
(d) none of the above are correct.

Question. Loop of Henle’s is found in:
(a)Lungs
(b) Liver
(c) Nephron
(d) Neuron

Question. Which of the following is most appropriate for aerobic respiration?
(a) Glucose ^mitochondria →Pyruvate ^Cytoplasm →CO₂ + H₂O + Energy
(b) Glucose ^Cytoplasm →Pyruvate ^mitochondria →CO₂ + H₂O + Energy
(c) Glucose ^Cytoplasm →Pyruvate + Energy ^mitochondria →CO₂ + H₂O
(d) Glucose ^Cytoplasm →Pyruvate + Energy ^mitochondria →CO₂ + H₂O + Energy

Question. The blood plasma without fibrinogen is called   
(a) serum
(b) bone marrow
(c) liquid tissue
(d) none of these. 

Question. The transport of water and minerals in plants is done by   
(a) xylem
(b) hormone
(c) tissues
(d) chloroplast

Question. The breakdown of food in cells to release energy is called
(a) Photosynthesis
(b) Respiration
(c) Transpiration
(d) Digestion

Question. The correct sequence of anaerobic reactions in yeast is
(a) Glucose Cytoplasm → Pyruvate mitochondria →Ethanol + Carbon dioxide
(b) Glucose Cytoplasm → Pyruvate Cytoplasm →Lactic acid
(c) Glucose Cytoplasm → Pyruvate mitochondria →Lactic acid
(d) Glucose Cytoplasm → Pyruvate Cytoplasm →Ethanol + Carbon dioxide

Question. The process by which organism takes nutrients is called
(a) Nutrition
(b) Respiration
(c) Photosynthesis
(d) Circulation

Question. Which of the following is not a characteristic of an organism.
(a) They can grow
(b) They respond to changs in environment
(c) They release energy during respiration
(d) They do not need food, and water

Question. Which of the following is a life process?
(a) Respiration
(b) Transportation
(c) Excretion
(d) All of these

Question. Saliva contains an enzyme called:
(a)Trypsin
(b) Ptyalin
(c) Amylase
(d) Pepsin

Question. Structural and functional unit of kidney is:
(a)Nephron
(b)Ureter
(c)Neuron
(d)Urethra

Question. The breakdown of pyruvate to give carbon dioxide,water and energy takes place in
(a)cytoplasm
(b)mitochondria
(c)chloroplast
(d)nucleus

Question. Blood from superior vena cava flows into————
(a)Right atrium
(b) Right ventricle
(c) Left atrium
(d) Left ventricle

Question. The doctor measured Ravi’s blood pressure and said it is normal now. The range of Ravi’s blood pressure (systolic/diastolic) is likely to be-
(a)120/80mm of Hg
(b)160/80mm of Hg
(c)120/60mm of Hg
(d)180/80mm of Hg

Questin. In amoeba, food is digested in the:         
(a) food vacuole
(b) mitochondria
(c) pseudopodia
(d) chloroplast

Questin. How is food transported from phloem to the tissues according to plants’ needs?     
(a) food is transported along with the water in the plant’s body.
(b) food is transported in only direction like water in the plant body through xylem.
(c) food is transported from a region with low concentration to higher concentration.
(d) Food is transported from a region where it is produced to other parts of the plants.

Questin. Which is the correct sequence of body parts in the human alimentary canal?     
(a) Mouth → stomach → small intestine → large intestine → oesophagus
(b) Mouth → oesophagus → stomach → small intestine → large intestine
(c) Mouth → stomach → oesophagus → small intestine → large intestine
(d) Mouth → oesophagus → stomach → large intestine → small intestine

Questin. What are the products obtained by anaerobic respiration in plants?     
(a) Lactic acid + Energy
(b) Carbon dioxide + Water + Energy
(c) Ethanol + Carbon dioxide + Energy
(d) Pyruvate

Questin. When a few drops of iodine solution are added to rice water, the solution turns blue- black in colour. This indicates that rice water contains:     
(a) fats
(b) complex proteins
(c) starch
(d) simple proteins

Questin. The respiratory pigment in human beings is:         
(a) carotene
(b) chlorophyll
(c) haemoglobin
(d) mitochondria

Questin. The image shows the excretory system in humans.
What is the importance of the labelled part in the excretory system?       
(a) It produces urine.
(b) It filters waste from the blood.
(c) It stores the urine till urination.
(d) It carries urine from the kidney to the outside.

Questin. The image shows the transport of gases in the body through the heart and lungs.     
Which option correctly shows the transport of oxygen to the cell?
(a) Lungs →pulmonary vein →left atrium →left ventricle →aorta → body cells
(b) Lungs →pulmonary vein →right atrium →right ventricle → aorta → body cells
(c) Lungs →pulmonary artery →left atrium → left ventricle → vena cava → body cells
(d) Lungs →pulmonary artery →right atrium → right ventricle→ vena cava → body cells

Questin. What is the percentage of the oxygen in the expired air when a person is resting:   
(a) 12%
(b) 16%
(c) 20%
(d) 24%

Questin. Which of the following is the important characteristic of Emphysema:               
(a) Destruction of the alveolar wall and air sacs in the lungs are damaged.
(b) Increase in the growth of the lung tissue.
(c) Inflammation in the wall of bronchi.
(d) Thickening of the artery walls of the lungs.

Questin. The image shows the bread moulds on a bread How do these fungi obtain nutrition?     
(a) by eating the bread on which it is growing
(b) by using nutrients from the bread to prepare their own food
(c) by breaking down the nutrients of bread and then absorbing them
(d) by allowing other organisms to grow on the bread and then consuming them

Questin. The characteristic processes observed in anaerobic respiration are         
i) presence of oxygen
ii) release of carbon dioxide
iii) release of energy
iv) release of lactic acid
(a) i), ii) only
(b) i), ii), iii) only
(c) ii), iii), iv) only
(d) iv) only

Questin. A plant gets rid of excess water through transpiration. Which is a method used by plants to get rid of solid waste products?     
(a) shortening of stem
(b) dropping down of fruits
(c) shedding of yellow leaves
(d) expansion of roots into the soil

Questin. Chemicals present in the tobacco smoke lead to the breakdown of the elastic tissue in the alveoli. Name this specific condition.   
(a) Heart disease
(b) Emphysema
(c) Bronchitis
(d) Lung cancer

Questin. Digestion of food starts from which organ of the human digestive system?   
(a) mouth due to the presence of saliva
(b) oesophagus that moves the food in gut
(c) that releases juices for fat breakdown
(d) which helps in mixing food with digestive juices

Questin. In which of the following groups of organisms, food materials are broken down outside the body and absorbed?             
(a) Mushroom, green plants, Amoeba
(b) Yeast, mushroom, bread mould
(c) Paramecium, Amoeba, Cuscuta
(d) Cuscuta, lice, tapeworm

Questin. The contraction and expansion movement of the walls of the food pipe is called:             
(a) translocation
(b) transpiration
(c) peristaltic movement
(d) digestion

Questin. The opening and closing of the stomatal pore depends upon     
(a) Oxygen
(b) temperature
(c) water in the guard cells
(d) concentration of CO₂
Correct Answer: Option 

Questin. The image shows how Amoeba obtains nutrition.       
How is this process advantageous for Amoeba?
(a) capturing of food takes less time
(b) complex food can be digested easily
(c) more amount of food can be consumed
(d) fast distribution of nutrition within the body

Question. During respiration, the exchange of gases take place in:     
(a) Trachea and larynx
(b) Alveoli of lungs
(c) Alveoli and throat
(d) Throat and larynx

Question. Which of the following statement(s) is/are true about heart?                 
(i) Left atrium receives oxygenated blood from different parts of body while right atrium receives deoxygenated blood from lungs
(ii) Left ventricle pumps oxygenated blood to different body parts while right ventricle pumps deoxygenated blood to lungs
(iii) Left atrium transfers oxygenated blood to right ventricle which sends it to different body parts
(iv) Right atrium receives deoxygenated blood from different parts of the body while left ventricle pumps oxygenated blood to different parts of the body
(a) (i)
(b) (ii)
(c) (ii) and (iv)
(d) (i) and (iii)

Question. Single circulation i.e., blood flows through the heart only once during one cycle of passage through the body, is exhibited by:   
(a) Labeo, Chameleon, Salamander
(b) Hippocampus, Exocoetus, Anabas
(c) Hyla, Rana, Draco
(d) Whale, Dolphin, Turtle

Question. Single circulation, i.e., blood flows through the heart only once during one cycle of passage through the body, is exhibited by: 
(a) Labeo, Chameleon, Salamander
(b) Hippocampus, Exocoetus, Anabas
(c) Hyla, Rana, Draco
(d) whale, dolphin, turtle

Question. In which of the following vertebrate group groups, does heart not pump oxygenated blood to different parts of the body?   
(a) Pisces and amphibians
(b) Amphibians and reptiles
(c) Amphibians only
(d) Pisces only

Question. Which of the following statements about the autotrophs is incorrect:             
(a) They synthesize carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll
(b) They store carbohydrates in the form of starch
(c) They convert carbon dioxide and water into carbohydrates in the absence of sunlight
(d) They constitute the first trophic level in food chains

Question. The xylem in plants are responsible for:             
(a) Transport of water
(b) Transport of food
(c) Transport of amino acids
(d) Transport of oxygen

Question. Which of the following is an incorrect statement?     
(a) Organisms grow with time.
(b) Organisms must repair and maintain their structure.
(c) Movement of molecules does not take place among cells.
(d) Energy is essential for life processes

Question. Oxygen liberated during photosynthesis comes from:     
(a) Water
(b) Chlorophyll
(c) Carbon dioxide
(d) Glucose

Question. In the list of organisms given below, those that reproduce by the asexual method are:   
(i) Banana (ii) Dog
(iii) Yeast (iv) Amoeba
(a) (ii) and (iv)
(b) (i), (iii) and (iv)
(c) (i) and (iv)
(d) (ii), (iii) and (iv)

Question. Nuclei can be seen clearly seen in a well prepared slide of epidermal peel of a leaf in the
(a) Guard cells only
(b) Epidermal cells only
(c) Guard cells as well as epidermal cells
(d) Stomata, guard cells and epidermal cells

Question. While preparing good temporary mount of leaf peel to observe stomata, care should be taken to avoid
(a) Adding glycerine to the slide
(b) Staining the peel with safranin
(c) Having air bubbles in the slide
(d) Using water to wash the slide

Question. Oxygen liberated during photosynthesis comes from
(a) water
(b) chlorophyll
(c) carbon dioxide
(d) glucose

Question. The blood leaving the tissues becomes richer in
(a) carbon dioxide
(b) water
(c) heamoglobin
(d) oxygen

Question. Photosynthesis takes place in the presence of
(a) Water and sunlight
(b) Oxygen and sunlight
(c) CO₂, water and sunlight
(d) CO₂ and O₂

100. The image shows the circulation of blood in fishes and humans. 

How is the circulation of blood in fish different from that in humans?
(a) The flow of blood in fish is unidirectional.
(b) The heart of fish has more chambers compared to that of a human.
(c) The blood goes through heart only once in fishes.
(d) The heart in fish is bigger in size

Question. The image shows the structure of an artery. 

Which statement supports the likely reason for thick walls in arteries?
(a) To sustain the high-pressure blood from the heart.
(b) To carry large amount of blood.
(c) To ensure blood flows in only one direction.
(d) To allow easy exchange of gases with cells.

Question. Oxygen liberated during photosynthesis comes from
(a) Water
(b) Chlorophyll
(c) Carbon dioxide
(d) Glucose

Question. Choose the event that does not occur in photosynthesis
(a) Absorption of light energy by chlorophyll
(b) Reduction of carbon dioxide to carbohydrates
(c) Oxidation of carbon to carbon dioxide
(d) Conversion of light energy to chemical energy

Question. Chlorophyll is present in
(a) Intrathylakoid space
(b) Thylakoid membrane
(c) Intermembrane space
(d) Inner membrane of envelope

Question. Choose the forms in which most plants absorb nitrogen
(i) Proteins (ii) Nitrates and Nitrites
(iii) Urea (iv) Atmospheric nitrogen
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)

Question. Which of the following statement(s) is (are) correct?
(i) Pyruvate can be converted into ethanol and carbon dioxide by yeast
(ii) Fermentation takes place in aerobic bacteria
(iii) Fermentation takes place in mitochondria
(iv) Fermentation is a form of anaerobic respiration
(a) (i) and (iii)
(b) (ii) and (iv)
(c) (i) and (iv)
(d) (ii) and (iii)

Question. When temperature increases, the rate of photosynthesis
(a) Increases
(b) Decreases
(c) First increases then decreases again
(d) Remains the same

Question. Before removing chlorophyll, the leaf is boiled in which one of the following solvent
(a) Formalin
(b) Water
(c) Alcohol
(d) Glycerine

Question. Find out the structure which is not present in chloroplast
(a) Granum
(b) Stroma
(c) Cristae
(d) Thylakoid

Question. Choose the correct statement that describes arteries.
(a) They have thick elastic walls, blood flows under high pressure; collect blood from different organs and bring it back to the heart
(b) They have thin walls with valves inside, blood flows under low pressure and carry blood away from the heart to various organs of the body
(c) They have thick elastic walls, blood flows under low pressure; carry blood from the heart to various organs of the body
(d) They have thick elastic walls without valves inside, blood flows under high pressure and carry blood away from the heart to different parts of the body.

Question. The filtration units of kidneys are called
(a) ureter
(b) urethra
(c) neurons
(d) nephrons

Question. A leaf is boiled in alcohol before using iodine for starch test in order to
(a) Dissolve starch
(b) Dissolve chlorophyll
(c) Soften the leaf
(d) Make it react with iodine

Question. In order to de-starch the leaves for an experiment to show that sunlight is necessary for photosynthesis
(a) Leaves are kept in alcohol and boiled in a water bath
(b) Leaves are soaked in iodine for two hours
(c) Plant with the leaves is kept in a dark room for 24 hours
(d) Plant with the leaves exposed to light of a lamp, a night before the experiment

Question. Autotrophic organisms include
(a) Bacteria and virus
(b) Bacteria and fungi
(c) Green plants and some bacteria
(d) Green plants and all bacteria

Question. Select the incorrect statement about the autotrophs
(a) They synthesise carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll
(b) They store carbohydrates in the form of starch
(c) They convert carbon dioxide and water into carbohydrates in the absence of sunlight
(d) They constitute the first trophic level

Question. The image shows the human digestive system.     

Digestion of food starts from which organ of the digestive system?
(a) Mouth due to the presence of saliva.
(b) Pancreas that releases juices for fat breakdown.
(c) Oesophagus that moves the food in gut.
(d) Stomach which helps in mixing food with digestive juices.

Question. The image shows a cross section of small intestine.     

What will be the likely happen if the number of villi increases in the intestine?
(a) Increase in the absorption of food.
(b) Fast breakdown of larger food particles into smaller ones.
(c) Increase in flow of blood in the small intestine.
(d) Fast elimination of waste from the body.

Question. An example for autotrophic nutrition
(a) Green plants
(b) Fungi
(c) Bacteria
(d) Humans

Question. Select the groups of organisms where food material is broken down outside the body and absorbed
(a) Mushroom, green plants, amoeba
(b) Yeast, mushroom, bread mould
(c) Paramecium, amoeba, cuscuta
(d) Cuscuta, lice, tapeworm

Question. Select the correct statement
(a) Heterotrophs do not synthesise their own food
(b) Heterotrophs utilise solar energy for photosynthesis
(c) Heterotrophs synthesise their own food
(d) Heterotrophs are capable of converting carbon dioxide and water into carbohydrates

Question. The diagram below represents a group of organs in the human body. Urine leaves the urinary bladder by passing through this structure labelled   

(a) A
(b) B
(c) C
(d) D

Question. Observe the experimental sets [A] & [B]. Observe the test tube A & B. From the list given below, choose the combination of responses of shoot and root that are observed in B.

(a) Positive phototropism and positive geotropism
(b) Negative phototropism and positive geotropism
(c) Positive phototropism and negative geotropism
(d) Only negative phototropism

Question. Given alongside is a sketch of a leaf partially covered with black paper and which is to be used in the experiment to show that light is compulsory for the process of photosynthesis. At the end of the experiment, which one of the leaf parts labelled I, II and III will become black when dipped in iodine solution? 

(a) I only
(b) II only
(c) I and III
(d) II and III

Question. A few drops of iodine solution were added to rice water. The solution turned blue-black in colour.
This indicated that rice water contains
(a) Complex proteins
(b) Simple proteins
(c) Fats
(d) Starch

Question. Photosynthesis is a
(a) Catabolic process
(b) Parabolic process
(c) Amphibolic process
(d) Photochemical process

Question. Select the appropriate equation which shows the summary of photosynthesis
(a) 6CO₂ + 12H₂O C₆H₁₂O₆ + 6O₂ + 6H₂O
(b) 6CO₂ + H₂O + Sunlight C₆H₁₂O₆ + O₂ + 6H₂O
(c) 6CO₂ + 12H₂O + Chlorophyll + Sunlight C₆H₁₂O₆ + 6O₂ + 6H₂O
(d) 6CO₂ + 12H₂O + Chlorophyll + Sunlight C₆H₁₂O₆ + 6CO₂ + 6H₂O

Question. During respiration exchange of gases take place in
(a) Trachea an Larynx
(b) Alveoli of Lungs
(c) Alveoli and Throat
(d) Throat and Larynx

(a) Both ‘A’ and ‘R’ are true and ‘R’ is correct explanation of the Assertion.
(b) Both ‘A’ and ‘R’ are true but ‘R’ is not correct explanation of the Assertion.
(c) ‘A’ is true but ‘R’ is false.
(d) ‘A’ is false but ‘R’ is true.

Question. Assertion: Nutrition, respiration, transportation, excretion, growth are essential processes for our life.
Reason: We cannot survive without these processes.

Question. Assertion: Our body can exchange energy and matter with the surrounding.
Reason: Our body is a closed system.

(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If Assertion is incorrect but Reason is correct.

Question. Assertion: Blood of insects is colourless.   
Reason: The blood of insect does not play any role in transport of oxygen.

Question. Assertion: Blood pressure is arterial blood pressure.   
Reason: It is measured by sphygmomanometer.

Question. Assertion: Chloroplast help in photosynthesis.   
Reason: Mitochondria have enzymes for dark reaction.

Question. Assertion: During physiology of excretion, deamination does not take place in liver.   
Reason: Deamination is a process to make use of excess of amino acids which can not be incorporated into protoplasm.

Question. Assertion: Photorespiration decreases net photosynthesis.   
Reason: Rate of respiration in dark and light is almost same in all plants.